I have 3 six week old barred rocks. At 4 weeks, we started putting them into the coop/run during the day. They've been up the ramp plenty of times and know how to get into the coop. Last night we decided it was time to let them stay out there full time. I put a heat lamp, and turned it on at dusk. We went back out after dark, and found them huddled together in the run underneath the coop. We moved them by hand into the coop, and shut the sliding door. They seemed very happy. Tonight I went out at dusk and moved them again. When are they going to figure out to do this on their own? Also, how long will they need a heat lamp. I've got a remote thermometer in the coop so I can monitor the temp from inside my house. It gets into the low 50's at night here (temperate California weather). With the heat lamp, it's in the mid 60's. thanks.